MEXICO. AV veinte (20) pesos (.90 fine; .4823 AGW). 16.64 gm. 27 mm. 1959. Eagle battling a snake; ESTADOS UNIDOS MEXICANOS around / Aztec sunstone; VIENTE PESOS around underneath; 15 Gr. ORO PURO in smaller letters below. KM 478. Good Extremely Fine; underlying iridescence.